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The 50 longest airline routes from the U.S. and Canada

What are the longest airline routes from North America? It's a question we get frequently at Today in the Sky, so I decided to reached out to the folks at OAG for a definitive answer. OAG is a leading airline

What are the longest airline routes from North America? It's a question we get frequently at Today in the Sky, so I reached out to the folks at OAG for a definitive answer.

OAG, of course, is a top airline data provider, but they also specialize in airline schedules (OAG once stood for "Official Airline Guide"). To help us answer the question, OAG provided Today in the Sky with the 50 longest regularly scheduled flights that depart from the United States and Canada.

You can see the list in the above gallery, starting with No. 50 – Vancouver, Canada, to Auckland, New Zealand – and going the whole way through No. 1: Dallas/Fort Worth to Sydney, Australia.

The list was compiled with flights operating as of Oct. 1, 2014, and looks only at departures leaving the U.S. and Canada. The list of "longest" flights is based on the nautical mile-distance of the flights flown. Some recently added flights – such as Emirates' nonstop from Chicago to Dubai and China Southern's from New York to Guangzhou – are recent additions to the "top 50."

The list received a big shake-up Sept. 29 when Qantas began flying an Airbus A380 from Dallas/Fort Worth. Previously, the carrier flew nonstop from Sydney to DFW on the U.S.-bound leg, but the return portion – the U.S. departure – stopped in Brisbane. That changed Sept. 29, bumping the previous No. 1 -- Delta's Atlanta-to-Johannesburg nonstop -- to No. 2.

Click through the list to see the 50 longest U.S. and Canadian departures as of Aug. 12.